Automatic drilling rig



Jan. 13,, 1931. c, pg I 1,789,241

AUTOMATIC DRILLING RIG Filed Nov. 25, 1929 2 Sheets-Sheet 1 Inventor 6. T.flaxwell flzmazarih A itorney Jan. 13, 1931. c. T. MAXWELL ,2

AUTOMATIC DRILLING RIG Filed Nov. 23, 1929 2 Sheets-Sheet 2 /8 J /6 6 /.9 M n 5' as i/ 43 46 22 ln ventor 6, f yaxwell A itorney e t Jan. 1931' g g- 2' g UNITE-D STATE- S PATENT oFFwE,

- 1 CALVINVTHURMMON MAXWELL, oF Hu1\ rrsvILLE,- i iixsf ALUTOMATI DRILLING-RIG j i'a pnati nfilea iiove'mb r zsfl'eaei' Shfia1iNo. 409,39 r

Thisinventionrelatesto drilling rigs,'and derrick? A pair of spaced transversely'exanjobj'ect of the invention i to provide a bull t uig-si ppo ti g bars -13"eX -'end acr'o s' wheel" for, association with the drilling rig 5' bot om of the derrick interiorly thereof'and that gives the maximum hammering; effect another bar 1-4 is secured between the two bars to tli'ewell'drilling'toollwiththe minimum of 13a: its opposite Gilda; es v jerking of the drill cable and at the same vAshaft15 i's-journaled in a bearing-160m time increases thenunhberof strokeshf the. One of the cross-bars 6 at'the bottom of the 1 a drill bit lati e to the a rotation of the opderrickand'adjacent the inner end'thereof it emtihgshaft. i I f is rotatably supported-on a" bearing 17' on we Ainothr objectf o'f-the invention is to'prt the cross bar 14; Onthe outerend of the 's. vide' a pairof resilient'pick up 'she'ave'wheels" shaft 15 is' ai pulley wheel 18 that is con for association with the drilling rig on'the' nected with a suitable'source "of power not V opposite sides of the bullflwheel through shown' in the'drawings,'bytlie'belt lQI' which thetable'is' tiaiiiedto furnish an uplift (3n the free inner {end of the shaft l5 is Witli the foregoingandother objects in scribed", a bull-wheel indicated" gneral-lyat" viwitheinventioii consists of'alnoveh cona 20.; In alineiiintwith theinner face of the 5 Striiction', coihbination and arrangement of; bull'wheel 28 are mounted- 2; pair of-sheave' parts, as'will be hereinafter nioi e' specifically wheels 2ly22 'onthe opposite sides io'f thebull -n1ount'ed ;in a manner tobe' presently" de '6 described-and illustratd'in the acconipany- Wheel 20. The sheavewheel's 2l, 22 afer'oing drawiiigs;wh reiii'isdisflosed an mb'odi tatahly meant ed; on the endsof bolts 23, mar o f'theinventioii'ibiit"itis meander: that extend throughopenings in the cross stood that changes the variations, 7 13. Disposed about the lower projectand modifi eatibns'rna'ybe resorted to without ing ends of the; bolts, 23 are helical coiled 25 departing.frofiitlie spirit of the claims here -sp'rings 24* which produce tension" downto appended. 7 V wefaly on the sheavewheels 2-1,'22.

' In the. drawings wherein like reference The coiled 24,'at their upper ends, characters :denote correipondiiigij parts press'on the crossbar ISwhile th'e lower ends Vthroughouttheseveral views thereof5 press against the liead'sof thebo-lts,

36 Figure 1 is aside elevation of the rig in wiier y sasien is exerted dowiiwar'dly on 323' the direction of the arrows.

accordance with the present invention, and the sheavewheelsi i s v v partly broken away. Th fin r end oft'h' 'ha ft'l5gh'asia rediieed Fig. 2 is a sectional view takensubstanspiiibl e nujlai shoulder '12 at tially on the line 22 of Fig, 1 looking in the were tie-twee" the reds-deaspindle v I6". and the disk 25' has central cl-ir- Fig. 3 is a diametric section in detail taking cu'l'ar rcjesses 2bl coiin te'fs iink in'it's 011'- through the bull Wheel substantially on line p'h 'site faces? The messes-mer e in a heavy 33 of Fig. 1. r ri-iri 28' that is (Sutsetwith respect to each Referring to the drawings in detail; 4 reprecess, there being right angle shoiilders 1 0 resents the conventional derrick used in the 29 3Wwlierthepeifipheriesbf the-recesses .9

oil fields for drilling oil wells. The derrick merge the difset rirn; r q 3 4 is formed of four upright legs 5 having eiji tends thrdiigliaiilopehicross bracings 6 and diagonal bracings 7 iiig3'1itliat-isofa largerfdiaineter thaii the" On the top ofthe derrick 4 there is a sheave spindle" so? tlfat the-' disk will? beddosely 4 wheel 8 on a shaft 9, the ends-of which are 1nounted*' .on t1ie of ratchet supported in bearings 10 secured on the top whea sae rtIie'recssefs'ZG; cross braces. with theputer;facesfoffeach fiushwitl-i thesid'e; A rope drum 11 is rotatably supported on tlie, 1 i ii?28ls e the a pair of brackets 12 and are secured to one rotheriextraiie'ous 'dli ects will not bedtime en'-- of the cross braces 6 and the bottom of the t'aiigIEd therEihF ma On the peripheral edge of each ratchet wheel 32, 33 are formed a series of ratchet teeth 34, the edges of which are in spaced ings in the ratchet wheels 32, 33 which register with theopening 31 and said ratchet wheels are rigidly coupled to the shaft lby means of a nut threadably engaging on theouter end ofthe spindle 16 I r p pawls36, 37 are seated in pockets 38, 39 formed on the rim 28 and the pockets. a

" nation, a shaft journaled across the bottom .of the derrick, a disk loosely mounted on the A pair of communicatewlth the spindle recesses 26,27

at the periphery thereof. The pawlsare our naled on a pin 40 that extends through'the rim 28l and are urged'outwardly'into engagement'with the teeth onithe ratchet .wheels, by

means of springs 4-1..

,Projecting laterallyHfrom the inneriface. of the rim 28 is a roller lwheel 42v that is rotatably mounted on a pin: i3 ,the-inner end of, which is anchored to theinnerface of the rim. Theperiphery of the rolleris concaved so .as to form a groove to receive the cable. I One endof the cable 45 issecured to and woundabout the drum 11, and the cable is trained thru the spring tensioned sheave wheels 21,22 and over the roller 42. Asthe roller 42 rotates .with the rim 28, its path will be in alinement with the cable 45 trained betweenthe sheave wheels. Theoeable is then trained over the pulley8: on top-of the derrick and on theiother free'end of thecable is a spring 46, to the lower end of which is at: tached a drill point 41X;

In thejoperation ofth turns the ratchetwheels 32, 33 in a clockwise direction and the pawls 36, 37' are engaged with'the ratchet teeth 3 L to turntherim 28 in a clockwise direction. turn counter-clockwise. The tension of the spring is less than-the weight of the drill tool so that when the drill tool is at the top of its stroke, as shown in Fig. 1 of the draw- 111 's to i'otate faster than the ratchet wheels, there by allowing the tool to drop with. great force.

7 Whenthe rim is reduced tothe samemomentum as the shaft-, the pawl locks the rim to the ratchet wheeland the roller engages the rope to carry the drill to the top of its stroke again. The parts in Fig. 1 of the drawings, are shown with the drill at thetop of its stroke. 7

By having tensioned sheave w posite sides of the bull wheel, it has been found that the jerk islessened on the drop the rim taking upon releasing the cable causes the maximum hammering efiect, with weight.

e rig, the shaft ,15

The rim cannot the weight of the tool causes the rim heels on iopand rebound of the drill point, eliminating wear and tear on therig. The rotation of claims, and the requirements of the prior art. I

Having thus described-my invention, what I claim as new is 1. A drill rig including a derrick, a cable drum mount-ed on the bottom of the derrick having a cable extending therefrom, a sheave wheel on the top of the derrick over which the cable-is trained, and adrill point on the freewend of the cable; comprising, in combishaft and having spring-pressed pawls mounted thereon, ratchet wheels rigidlycoup led tothe shaft; and engageable with, the;

through which the cable is trained for re lieving jerkingon the cable, and a roller journaled on one'face of the disk projecting into 'thepath of the cable to raise the drill polnt and permit it to fall under its own ,2; A bull wheel men in a drive than,"

comprising a disk looselymounted on the V shaft and having central recesses in'its oppositefaces merging. in an outset rim, pock I ets formed the rim in communication with the recesses, spring pressed pawls mounted in the pockets and urged inwardly-into the V recesses, alpair of ratchet wheels having pe-j rlpheral teeth and rigidly coupled to the shaft and seated :flush in said recesses with the teeth engageable with said pawls to permit the disk to rotate inone direction only, and a laterally projecting .rollerion the rim for intermittent engagement with a drill cable. l

In testimony whereof I aflix my signature CALVIN THURMMON MAXWELL. 

